Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1995-03-15
1996-08-27
Sikes, William L.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 75, 359 99, 359 63, 359 93, G02F 11335, G02F 1137
Patent
active
055506623
ABSTRACT:
A color liquid crystal display (LCD) includes many ones of a color cell triad (150) of liquid crystal cells (80R, 80G, 80B) and a negative birefringence compensator plate (110). The color cell triads are positioned between a pair of linear polarizers (112, 114), and each color cell triad is in optical association with colored filters (152R, 152G, 152B). Each of the liquid crystal cells has a symmetrical director field (82, 82') that produces a symmetrical but nonuniform color viewing circle curve (100) from the liquid crystal cell. The negative birefringence plate restores the color viewing angle uniformity. When graphed on a polar plot, the measured light transmission percentage curves (120, 122, 124) characterizing the LCD are substantially concentric circles surrounding the optical axis (18) for all azimuthal angles (28) and viewing angles (24) up to 30 degrees. Thus, the color LCD provides a multi-color display having colors that are perceptibly uniform over a wide range of azimuthal and viewing angles.
REFERENCES:
patent: 4583825 (1986-04-01), Buzak
patent: 5150235 (1992-09-01), Haim et al.
patent: 5196953 (1993-03-01), Yeh et al.
patent: 5231522 (1993-07-01), Sumiyoshi
patent: 5250214 (1993-10-01), Kanemoto et al.
"Multi-Domain Homeotropic LCDs with Symmetrical Angular Optical Performances," H. L. Ong. SID Digest, 1992, pp. 405-408.
"Two-Domain Twisted Nematic and Tilted Homeotropic Liquid Crystal Displays for Active Matrix Applications," K. H. Yang, Proceedings of the International Display Research Conference, IEEE, Aug. 1991, pp. 68-72.
"Full-Cone Wide-Viewing-Angle Multicolor CSH-LCD," Yamamoto et al., SID Digest, 1991, pp. 762-765.
"Vertically Aligned Liquid-Crystal Displays," J. F. Clerc, SID Digest, 1991, pp. 758-761.
"The pi-Cell: A Fast Liquid-Crystal Optical-Switching Device," P. J. Bos and K. R. Koehler/Beran, Molecular Crystals and Liquid Crystals, Gordon and Breach, Science Publishers, Inc., 1984, Vol. 113, pp. 329, 332-337.
"44.3: Film-Compensated Parallel-Aligned Cells for High-Speed LCDs", S-T. Wu, A. M. Lackner, Hughes Research Lab., Malibu, CA., SID 94 Digest.
"44.3: Improvement of Gray-Scale Performance of Optically Compensated Birefringence (OCB) Display Mode for AMLCDs", C-L. Kuo, et al., Tohoku University, Sendai, Japan, SID 94 Digest.
"S7-4 New Normally White Negative Birefringence Film Compensated Twisted Nematic LCDs with Largest Viewing Angle Performance", H. L. Ong, IBM T. J. Watson Res. Ctr., Yorktown Heights, NY.
Angello Paul S.
Duong Tai V.
Sikes William L.
Tektronix Inc.
Winkelman John D.
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